# Rails and JRuby **URL:** \ **Category:** Rails\ **Created:** [March 21, 2006, 8:15pm UTC](https://www.ruby-forum.com/t/rails-and-jruby/84881 "2006-03-21T20:15:46Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![weyus](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/7ab992/32.png) [@weyus](https://www.ruby-forum.com/u/weyus)\ **Post date:** [March 21, 2006, 8:15pm UTC](https://www.ruby-forum.com/t/rails-and-jruby/84881/1 "2006-03-21T20:15:46Z")
Has anyone attempted to run Rails inside of JRuby? Is that even possible? Aside from the performance implications, is it a bad idea? I’m thinking that it might be useful in very rare cases where a Ruby/Rails - equivalent of a Java solution may not exist yet. Any thoughts? Wes ---
**Author:** ![weyus](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/7ab992/32.png) [@weyus](https://www.ruby-forum.com/u/weyus)\ **Post date:** [March 21, 2006, 8:38pm UTC](https://www.ruby-forum.com/t/rails-and-jruby/84881/2 "2006-03-21T20:38:14Z")
JRuby isn’t a complete Ruby implementation. It won’t work. Apart from other things using c libraries is not possible. It’s better to use [http://raa.ruby-lang.org/project/rjb/](http://raa.ruby-lang.org/project/rjb/) as a bridge if you need to use java whiting Ruby. ---
**Author:** ![weyus](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/7ab992/32.png) [@weyus](https://www.ruby-forum.com/u/weyus)\ **Post date:** [March 21, 2006, 9:10pm UTC](https://www.ruby-forum.com/t/rails-and-jruby/84881/3 "2006-03-21T21:10:21Z")
On 3/21/06, Wes G. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Has anyone attempted to run Rails inside of JRuby? Yes, it’s currently being worked on by the JRuby maintainers. Jump over to the JRuby lists at [http://sourceforge.net/mail/?group\_id=35413](http://sourceforge.net/mail/?group_id=35413) for details. See also recent posts at [http://headius.blogspot.com](http://headius.blogspot.com). Is that even possible? Not yet, but the plan is to have something to demo by JavaOne this year. Aside from the performance implications, is it a bad idea? I personally don’t think so – on the contrary, a solid implementation of Ruby on the JVM would do wonders for Ruby adoption across the huge installed base of Java and JVMs. For people accustomed to Java-based webapp deployments (like me), the idea of running Rails in a Java environment is staggering and liberating. Cheers, /Nick ---
**Author:** ![weyus](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/7ab992/32.png) [@weyus](https://www.ruby-forum.com/u/weyus)\ **Post date:** [March 22, 2006, 5:13am UTC](https://www.ruby-forum.com/t/rails-and-jruby/84881/4 "2006-03-22T05:13:57Z")
Nick S. wrote: > installed base of Java and JVMs. For people accustomed to Java-based > webapp deployments (like me), the idea of running Rails in a Java > environment is staggering and liberating. Yeah, so I can have my servlet container… waaaaaa! b ---
**Author:** ![weyus](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/7ab992/32.png) [@weyus](https://www.ruby-forum.com/u/weyus)\ **Post date:** [March 22, 2006, 2:58am UTC](https://www.ruby-forum.com/t/rails-and-jruby/84881/5 "2006-03-22T02:58:13Z")
Nick S. wrote: > environment is staggering and liberating. > +1 Justin ---
**Author:** ![weyus](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/7ab992/32.png) [@weyus](https://www.ruby-forum.com/u/weyus)\ **Post date:** [March 30, 2006, 8:35am UTC](https://www.ruby-forum.com/t/rails-and-jruby/84881/6 "2006-03-30T08:35:01Z")
Thank you Nick for catching this…I need to start filtering to catch “JRuby” emails on the Rails list too 🙂 We are working feverishly right now to get Rails working on JRuby by mid-may, for our JavaOne presentation. I can give a brief status update here: What works: - script/generate runs, with all the base generators in 1.0. I have not done a comparison, but it appears to be generating correct code and configuration. Considering that generate loads up a substantial portion of Rails, we’re pretty happy that this runs successfully now. - some other scripts in /script run, but we have not done a lot of additional testing What doesn’t work: - Actually handling a rails request (i.e. through dispatch.cgi) gets pretty far, but it’s still bombing out due to interpreter issues or missing functionality in JRuby. We believe that we’re pretty close, however. How it will work: We will probably create a “CGI Servlet” that primes JRuby’s environment such that Rails can run out-of-the-box. This should allow anyone to take a typical Rails app and a given Rails release, JAR them up in an appropriate way, and deploy them to your application server of choice. Our emphasis is to first make Rails run exactly as it does today, without requiring any unnecessary modification or special configuration (following the Rails mentality). Eventually we would also like to provide seamless support for Rails to use J2EE services as though they were Rails equivalents. For example ActiveRecord adapters to JDBC, remote services in EJBs or Web Service mapped appropriately into the Rails world, JTA transaction management, clustering, failover, the ability to use JSPs for Rails presentation (such that existing apps with extensive existing UIs could be “half-ported” to Rails right away), and so on. Anything you do in J2EE could be mapped into its much more consumable Rails equivalent. We’re very excited about the possibilities of JRuby on Rails, and we hope it will help make Rails a viable option for all those Java-only shops out there. ---
**Author:** ![weyus](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/7ab992/32.png) [@weyus](https://www.ruby-forum.com/u/weyus)\ **Post date:** [March 30, 2006, 8:00pm UTC](https://www.ruby-forum.com/t/rails-and-jruby/84881/7 "2006-03-30T20:00:11Z")
The “missing” features have ranged from bugs in the interpreter (for example, classes not being created with the correct nesting or scope) to Java’s inability (pre-1.5) to access environment variables (which makes running a JRuby on Rails “test CGI” impossible). We’re adding everything that’s missing right now, with a run, debug, fix cycle. Most of the recent issues have been minor things missing from JRuby’s core Ruby libraries, which are usually easy to add. ---
**Author:** ![weyus](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/7ab992/32.png) [@weyus](https://www.ruby-forum.com/u/weyus)\ **Post date:** [March 30, 2006, 9:26am UTC](https://www.ruby-forum.com/t/rails-and-jruby/84881/8 "2006-03-30T09:26:42Z")
Charles O Nutter wrote: > What doesn’t work: > > - Actually handling a rails request (i.e. through dispatch.cgi) gets pretty > far, but it’s still bombing out due to interpreter issues or missing > functionality in JRuby. We believe that we’re pretty close, however. Interesting - what’s missing? – David N. Welton - [http://www.dedasys.com/davidw/](http://www.dedasys.com/davidw/) Linux, Open Source Consulting - [http://www.dedasys.com/](http://www.dedasys.com/)